jianying/lib/srt.js

A CLI Tools for parse JianyingPro Projects.

const fs = require('fs')
const path = require('path')

const pad = num => (num < 10 ? '0' : '') + num

const parseTime = time => {
  time = time / 1000000
  const h = Math.floor(time / 3600)
  const m = Math.floor((time - h * 3600) / 60)
  const s = Math.floor(time - h * 3600 - m * 60)
  const ms = time - Math.floor(time)
  return `${pad(h)}:${pad(m)}:${pad(s)},${ms.toFixed(3).substr(2)}`
}

module.exports = name => {
  if (typeof name !== 'string') {
    throw new TypeError(`Expected a string, got ${typeof name}`)
  }

  const filename = path.resolve(name)
  const content = fs.readFileSync(filename, 'utf8')
  const { tracks, materials } = JSON.parse(content)

  const { segments } = tracks.find(t => t.type === 'text' && t.segments.length > 10)

  const srt = segments.map((item, index) => `${index}
${parseTime(item.target_timerange.start)} --> ${parseTime(item.target_timerange.start + item.target_timerange.duration)}
${materials.texts.find(t => t.id === item.material_id).content}
`).join('\n')

  console.log(srt)
}